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Dihydroflavonols from Lannea coromandelica.

M T Islam1, S Tahara

  • 1Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo, Japan.

Phytochemistry
|October 3, 2000
PubMed
Summary

Researchers isolated five dihydroflavonols from Lannea coromandelica stem bark, including a rare cis-type isomer. These compounds were identified for the first time in the Lannea genus, expanding knowledge of plant-derived natural products.

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Area of Science:

  • Phytochemistry
  • Natural Product Chemistry
  • Organic Chemistry

Background:

  • Lannea coromandelica is a plant species with potential medicinal properties.
  • The isolation of dihydroflavonols from this genus is not well-documented.
  • Understanding the chemical constituents of Lannea species is important for ethnobotanical and pharmacological research.

Purpose of the Study:

  • To isolate and characterize dihydroflavonols from the stem bark of Lannea coromandelica.
  • To identify novel compounds and rare isomers within the Lannea genus.
  • To contribute to the phytochemical knowledge of Lannea species.

Main Methods:

  • Extraction of compounds from Lannea coromandelica stem bark.
  • Purification of isolated compounds using chromatographic techniques.
  • Structure elucidation using spectroscopic methods, including 2D Nuclear Magnetic Resonance (2D NMR) and Circular Dichroism (CD) analysis.

Main Results:

  • Five dihydroflavonols were successfully isolated: (2R,3S)-(+)-3',5-dihydroxy-4',7-dimethoxydihydroflavonol, (2R,3R)-(+)-4',5,7-trimethoxydihydroflavonol, (2R,3R)-(+)-4',7-di-O-methyldihydroquercetin, (2R,3R)-(+)-4',7-di-O-methyldihydrokaempferol, and (2R,3R)-(+)-4'-O-methyldihydroquercetin.
  • All five compounds represent new discoveries within the Lannea genus.
  • (2R,3S)-(+)-3',5-dihydroxy-4',7-dimethoxydihydroflavonol was identified as a rare cis-type isomer.

Conclusions:

  • The study successfully identified and characterized five dihydroflavonols from Lannea coromandelica.
  • This research marks the first isolation of these compounds from the Lannea genus, expanding its known phytochemical profile.
  • The identification of a rare cis-type isomer highlights the chemical diversity within this plant species.

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